fix(session): drop the <context> envelope and project context verbatim

context/message previously defaulted to a <context source="…">…</context>
wrapper. No model is trained on a <context> tag either, and message
framing does not belong on the session surface: the surface projects the
durable log, and a caller that wants a frame formats its own content —
which the one heavy producer (workspace-context) already does with its own
<system-reminder> frame, opting out via 'raw'. The tag only added
machinery — ContextEnvelope plus an envelope field threaded through
InjectOptions, HookContext, the context/message event, and the agent-loop
inject/additionalContexts plumbing.

context/message now projects its content verbatim as a user-role message,
sharing one deriveEventMessage case with user/message and steering/message.
ContextEnvelope and every envelope field are removed; context/message.meta
still carries durable, model-hidden JSON state. Regenerated catalogs and
website API; refreshed the three affected keyless snapshots (envelope field
only; timestamps unchanged).

Broadens and renames the steering Agent Note to cover both envelope
removals as one decision.

Agent Note: .agents/notes/implemented/simplification/2026-07-20-unwrap-injected-content-envelopes.md

website/zh-CN/api/harness/events.md

@@ -28,7 +28,7 @@ A fully configured agent and live session were published. Setup is composition-o
 
 - `agent` — the newly registered agent with its live session and completed setup. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L147)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L143)
 
 ### agent/disposed
 
@@ -50,7 +50,7 @@ An agent left the registry; AgentLoop emits this after driver quiescence but bef
 
 - `agent` — the exact agent removed from the registry. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L156)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L152)
 
 ### agent/error
 
@@ -77,7 +77,7 @@ A step or turn errored. The loop reports a failure here (plus the logger) even w
 - `step` — the step at which the failure surfaced.
 - `error` — the failure, verbatim. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L311)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L307)
 
 ### agent/post-step
 
@@ -105,7 +105,7 @@ Awaited serial checkpoint after the response, real or synthetic tool results, in
 - `step` — the open step number.
 - `signal` — the turn abort signal. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L264)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L260)
 
 ### agent/pre-step
 
@@ -133,7 +133,7 @@ Awaited serial checkpoint before `step/start`; appends land outside the pending
 - `step` — the pending step number.
 - `signal` — the turn abort signal.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L204)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L200)
 
 ### agent/prompt-submit
 
@@ -158,7 +158,7 @@ Allow, rewrite, or block one drained prompt before it becomes a user message. Ca
 - `content` — the drained message's blocks, as queued.
 - `source` — the message's resolved source. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L214)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L210)
 
 ### agent/queued
 
@@ -183,7 +183,7 @@ Detached, frozen content entered the agent's inbox. Source defaults have already
 - `content` — the accepted content blocks retained by the inbox.
 - `info` — the accepted source plus whether it entered as steering. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L175)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L171)
 
 ### agent/request
 
@@ -211,7 +211,7 @@ Replace the frozen call configuration. Model-visible content must use logged cha
 - `step` — the step whose request this is.
 - `config` — the config the loop would use (frozen); return a replacement to switch. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L226)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L222)
 
 ### agent/request-error
 
@@ -243,7 +243,7 @@ Recover a model-request failure after its failed step has closed. `retry` opens
 - `retryAttempt` — zero-based number of prior recovery retries.
 - `signal` — the turn abort signal. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L278)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L274)
 
 ### agent/session-prefix
 
@@ -273,7 +273,7 @@ Compose request-only messages placed before derived history. The frozen result i
 - `prefix` — the frozen seed; return an extended replacement.
 - `signal` — aborts composition when the step is torn down.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L241)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L237)
 
 ### agent/session-start
 
@@ -298,7 +298,7 @@ The session lifecycle began, once before the first turn. Use `agent.inject()` to
 - `agent` — the agent whose session lifecycle began.
 - `source` — why the session started (fresh startup, resume, …). Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L188)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L184)
 
 ### agent/status
 
@@ -321,7 +321,7 @@ Agent status changed (`idle` ⇄ `running`, or → `disposed`). `send()` does no
 - `agent` — the agent whose status flipped.
 - `status` — the status just entered (the transition's destination). Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L165)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L161)
 
 ### agent/step-result
 
@@ -348,7 +348,7 @@ Waterfall: post-process the assembled assistant Message before tool dispatch (va
 - `step` — the step that produced the message.
 - `message` — the assistant message as assembled from the stream. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L252)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L248)
 
 ### agent/turn-continuation
 
@@ -373,7 +373,7 @@ Override whether the turn continues. The default continues after tool calls or s
 - `turn` — the turn being continued or stopped.
 - `defaultDecision` — what the loop would do absent an override. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L288)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L284)
 
 ### agent/turn-stop
 
@@ -397,7 +397,7 @@ Monotonic terminal-stop checkpoint after continuation and steering are folded; a
 - `agent` — the agent whose composed continuation outcome may be stopped.
 - `turn` — the turn at its terminal-stop checkpoint. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L298)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/agent/src/types.ts#L294)
 
 ## agent-loop/*
 

website/zh-CN/api/harness/sessions.md

@@ -7,7 +7,7 @@
 In-memory session store (`ctx.sessions`).
 Persistence is intentionally not implemented here — persistence plugins subscribe to `session/event` and flush on `session/flush` / dispose.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L574)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L549)
 
 ### ctx.sessions.create(id?, options?)
 
@@ -44,7 +44,7 @@ For an agent whose session must be torn down IN ORDER with its loop (so the loop
 
 **Returns** the live session, already entered and announced.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L603)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L578)
 
 ### ctx.sessions.prepare(id?, options?)
 
@@ -75,7 +75,7 @@ Build a session WITHOUT entering it into the store — validate the id/cwd and c
 
 **Returns** the constructed session, NOT yet in the store.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L632)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L607)
 
 ### ctx.sessions.enter(session)
 
@@ -112,7 +112,7 @@ Re-checks the id for a duplicate: `prepare` and `enter` are public cross-package
 
 **Returns** the detach disposer (publication hooks + store removal). When called from a synchronous `session/created` listener, removal and disposal wait until that creation dispatch unwinds.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L676)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L651)
 
 ### ctx.sessions.announce(session)
 
@@ -131,7 +131,7 @@ Emit `session/created` exactly once for an entered session (with the carrier ent
 
 - `session` — the entered session to announce to listeners.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L731)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L706)
 
 ### ctx.sessions.flush(session)
 
@@ -156,7 +156,7 @@ Dispatch the awaited `session/flush` durability checkpoint for `session`, with t
 
 **Returns** resolves when every flush listener has settled; after all settle, rejects with the first registered listener failure if any listener failed.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L783)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L758)
 
 ### ctx.sessions.get(id)
 
@@ -175,7 +175,7 @@ Look up a live session.
 
 **Returns** the session, or undefined when no live session has that id.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L815)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L790)
 
 ### ctx.sessions.list()
 
@@ -191,7 +191,7 @@ All live sessions, in creation order.
 
 **Returns** a fresh array; mutating it does not affect the store.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L823)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L798)
 
 ### ctx.sessions.fork(source, boundary?, childSessionId?)
 
@@ -220,4 +220,4 @@ Create a live child session from a turn-enclosed prefix of a live source. `bound
 
 **Returns** The created live child session.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L840)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L815)